feat(gateway): 重构 usage 数据层、迁移系统与系统导入

数据库迁移:
- 引入 baseline v2 bootstrap，空库首次启动自动初始化
- 服务启动不再自动执行迁移，需显式 `--migrate` 运行
- 新增 pending migration 检测，schema 落后时拒绝启动

Usage 数据层:
- usage body 存储外部化为独立 blob 表
- 新增 HTTP audit 表拆分存储请求/响应头与 body ref
- 后台清理任务支持 legacy body ref 元数据迁移
- usage runtime 写入迁移到专用 tokio runtime（独立线程池, 8MB 栈）

系统导入/导出:
- 支持用户、API Keys、钱包数据的完整导入
- 兼容 legacy 与 v1.3+ 两种导出格式

其他改进:
- executor outcome 增加 runtime miss 诊断上下文
- 主 tokio runtime 栈大小调整为 8MB
- 前端 provider 管理支持 base URL 配置
- dev.sh 支持 --migrate 参数

apps/aether-gateway/src/maintenance/runtime/tests.rs

@@ -28,7 +28,8 @@ use super::{
     stats_hourly_aggregation_target_hour, summarize_postgres_pool, usage_cleanup_settings,
     usage_cleanup_window, wallet_daily_usage_aggregation_target, AppState, DbMaintenanceRunSummary,
     FailedPendingUsageRow, GatewayDataState, ProxyUpgradeRolloutProbeConfig, StalePendingUsageRow,
-    UsageCleanupSettings, USAGE_CLEANUP_HOUR, USAGE_CLEANUP_MINUTE,
+    UsageCleanupSettings, DELETE_STALE_WALLET_DAILY_USAGE_LEDGERS_SQL,
+    SELECT_WALLET_DAILY_USAGE_AGGREGATION_ROWS_SQL, USAGE_CLEANUP_HOUR, USAGE_CLEANUP_MINUTE,
     WALLET_DAILY_USAGE_AGGREGATION_HOUR, WALLET_DAILY_USAGE_AGGREGATION_MINUTE,
 };
 
@@ -77,6 +78,18 @@ async fn spawn_pool_monitor_worker_skips_when_postgres_unavailable() {
     assert!(spawn_pool_monitor_worker(Arc::new(GatewayDataState::disabled())).is_none());
 }
 
+#[test]
+fn wallet_daily_usage_queries_use_settlement_snapshots_for_wallet_identity() {
+    assert!(
+        SELECT_WALLET_DAILY_USAGE_AGGREGATION_ROWS_SQL.contains("JOIN usage_settlement_snapshots")
+    );
+    assert!(SELECT_WALLET_DAILY_USAGE_AGGREGATION_ROWS_SQL
+        .contains("usage_settlement_snapshots.wallet_id"));
+    assert!(DELETE_STALE_WALLET_DAILY_USAGE_LEDGERS_SQL.contains("JOIN usage_settlement_snapshots"));
+    assert!(DELETE_STALE_WALLET_DAILY_USAGE_LEDGERS_SQL
+        .contains("usage_settlement_snapshots.wallet_id = ledgers.wallet_id"));
+}
+
 fn sample_connected_proxy_node(
     node_id: &str,
     heartbeat_interval: i32,